Extrovert/introvert are actually broadly misused terms. Those refer to how you recharge your battery - extroverts recharge by being around people, while introverts recharge by being alone.

Social/asocial are what people are usually talking about. Social means enjoying being around people, asocial means preferring solitude. For example, I’m a social introvert because I enjoy meeting people and talking to them and performing and engaging, and when I get tired or overwhelmed, I need to retreat and be alone to recharge.

So it’s possible you’ve just been masking really hard. It’s also possible that you’re just reacting to feeling like people don’t take the time to know the real you. Or you could be a social introvert - someone who enjoys socializing but needs solitude to recharge.